<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>类型检查</title>
    <script>
        var a = 10;
        var b = '10';

        //typeof 用来检查一个值得类型
        console.log(typeof 10)
        console.log(typeof b)

    </script>

</head>
<body>

</body>
</html>